CI (Buildkite): rootfs_images: allow user to override the default value of tag_name (#41549)

(cherry picked from commit a9232d6)

Author: DilumAluthge

.buildkite/rootfs_images/llvm-passes.jl

@@ -26,4 +26,4 @@ packages = [
 tarball_path = debootstrap("llvm-passes"; packages)
 
 # Upload it
-upload_rootfs_image(tarball_path)
+upload_rootfs_image(tarball_path; tag_name = "v1")

.buildkite/rootfs_images/rootfs_utils.jl

@@ -82,9 +82,10 @@ function debootstrap(name::String; release::String="buster", variant::String="mi
     return tarball_path
 end
 
-function upload_rootfs_image(tarball_path::String; github_repo::String="JuliaCI/rootfs-images")
+function upload_rootfs_image(tarball_path::String;
+                             github_repo::String="JuliaCI/rootfs-images",
+                             tag_name::String="v1")
     # Upload it to `github_repo`
-    tag_name = "v1"
     tarball_url = "https://github.com/$(github_repo)/releases/download/$(tag_name)/$(basename(tarball_path))"
     @info("Uploading to $(github_repo)@$(tag_name)", tarball_url)
     run(`$(ghr_jll.ghr()) -u $(dirname(github_repo)) -r $(basename(github_repo)) -replace $(tag_name) $(tarball_path)`)